Mietillow r



(No Model.)

M. R. CLAPP. 00mm TUBE BOILER.

Patented Mar. 1, 1887.

' UNITED STATES PATENT OFFICE.

MIR'IILLOWV R. OLAPP, OF" HUDSON, NEW YORK, ASSIGNOB TO THE CLAPP &

JONES MANUFACTURING 00., OF SAME PLACE.

COlLED-TUBE BOILER.

SPECIFICATION forming part of Letters Patent No. 358,430, dated March 1, 1887.

' Application filed August 25, 1886. Serial No. 31,735. (No model.)

To all whom it may concern:

Be it known that I, MIRTILLOW R. OLAPP, of Hudson, county of Columbia, and State of NewYork, have invented certain new and use 5 ful Improvements in Sectional Coiled-Tube Boilers, of which the following is a full, clear, and eXact description, reference being bad to the accompanying drawings, and to the letters of reference marked thereon.

My invention has particular relation to that class of steam-boilers or steam-generators used in connection with steam fire-engines; but the invention is applicable as well in any boiler for any use wherein economy of space and 5 quick steam-generating powers are desirable.

The object of my invention is to produce a simple, compact, and durable boiler, which may be easily constructed or repaired when required, wherein large heating-surface and quiet, uniform, positive circulation are provided for and insured, wherein the water may be quickly heated or easily maintained at a high temperature alike throughout the entire watcr-space,and wherein other advantages are 5 secured, as will hereinafter appear.

To accomplish all of this my improvements involve certain new and useful peculiarities of construction, relative arrangements or combinations of parts,and principles of operation,

3 as will be herein first fully described, and

then pointed out in the claims.

In the accompanying drawings, forming part of this specification, Figure l is a sec tional elevation of a sectional coiled tube boiler constructed and arranged for operation in accordance with my invention and involving my improvements. Fig.2 is a partial plan and horizontal section of the boiler, the plan showing the tops of the vertical flues or tubes 4 and the section passing through the coiled tubes. Fig. 3 is a sectional view of a fragmentof one of the tubes detached, showing the interior coiled-wire obstruction.

In all the figures like letters of reference,

wherever they occur, indicate corresponding parts. r

A is the outer shell of the boiler, of any desired size, and this is provided with any preferred form of head,as B, mounted in the usual manner.

0, of considerable depth, the wallor walls Within the outer shell is afire-box,

whereof are parallel with the outer shell, leaving a narrow water-space between the two, as plainly shown, and the fire box is provided with a head, D, at its upper end. Between D and the upper head, E, of-the boiler are a number of tubes or flues, a a a, &c., for the passage of smoke and products of combustion from the fire-box and for the purpose of conveying heat to the steam within the steamspace. Between the outer shell andfire-box: a ring, F, is inserted to close the space at its location, and this is riveted in or secured in the ordinary way. G is the grate,which may be of any pattern.

Within the fire-box are several rows of was 7 ter-conveying tubes, (three rows in the example shown,) I) Z) t, 850., each tube running in a general spiral direction around the inside of the box, each connected with the head D and communicating with the space above, the points of connection being so spaced that when the tubes are located the hot gases and products of combustion may pass between and around them at all points. For connecting these tubes with head D any approved form of couplings may be employed as, forinstance, the union couplings shown at 0. These are preferred because of the ease with which by their use the tubes may be inserted or removed,

The lower ends of the tubes 1) b are connected with the sides of the fire-box and communicate with the exterior water-space, the connection being made by suitable bends or elbows and unioncouplings, as shown at d d. In this location, also, union couplings are preferred, but other forms might be employed, if desired.

The coils or tubes in each row all run in the same direction; but as between any two rows must be as nearly uniform and effective as pos- I00 sible at all points. Under this arrangement shown the water-tubes occupy the greater part of the space in the fire-box, giving the necessary extended heating-surface.

All parts of each tube are subjected to about the same degree of heat, and each tube is heated about as are all the rest. The fall or the general inclination of each tube is so great that the free circulation of water is insured, and this to such extent that overheating under the hardest firing is impossible.

The tubes 1) each extend a little beyond the length necessary to complete the circuit within the fire-box, and so by running them in spiral directions they are made of the requisite length to afford the desired extent of exposure to the fire and at the same time allow ample room for the required number and length of smoke-tubes above, which room is by no means afi'orded when the water-tubes are vertical, as in the most common constructions.

When run spirally, the tubes are longer, and therefore less numbers of them are required to afford the desired extent of heatingsurface, and there results,therefore,a less number of connections with the head, leaving more room for the connections of the vertical smoke tubes with the head.

The lengths of the tubes should not be so great as to interfere with the free and quiet circulation of water therein, and for that rea son I carry them only a little beyond one complete circuit, as above explained. If too long, steam is formed therein, producing considerable noise and forcingjets of water and steam up into the steam-chamber and over into the engine, as is well understood.

An important advantage due to this peculiar construction is the ease and certainty with which all the water in the boiler may be heated by the detached heater, as is practical in steamfire-engine houses. The currents from the detached heater are carried uniformly through all parts of the boiler, and the water in the boiler thus uniformly heated and the boiler brought to good condition to produce steam very soon after the fire is started.

Three or more sections or rows of watertubes maybe adopted. Of the inner section any'tube can be removed without disturbing the others, and to remove any one or more from the outer sections it is only necessary to detach those which are in the way. All may be detached or replaced easily and quickly.

Under excessive firing, water is liable to be ejected from the circulating tubes into the steam-space, and to obviate this I supply the tubes 1) with a slight obstruction formed by a simple coil of wire, 0, located within the tubes. This is best shown at Fig. 3. It forms an obstruction sufficient to break up the current of water and steam through the tubes in such manner as to prevent the violent ejection of water, and at the same time does not interfere with the positive, free, and uniform circulation, which is maintained under all ordinary circumstances. The coiled wire is easily removed or inserted, and does not add materially to the cost. This form of obstruction will be found useful in the water-circulating tubes of any boiler, whether of the construction shown herein or of other form.

The boiler constructed and arranged as above explained will be found to answer the purpose or object of the invention, as previously stated.

Having now fully described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In a boiler of the character herein set forth, the series of independent spiral watertubes located within the fire-box, connected with the annular space around the fire'box and with the water and steam space above it, and arranged in independent sections or rows, one section or row of the independent tubes being located within or concentric with the other section or row, and each tube provided with an interior obstruction, constructed substantially as shown and described.

2. In a steamboiler, the combination, with the fire-box,of the vertical smoke-tubes above said box and the series of independent spiral water-tubes arranged in concentric and independent sections or rows within the box, the smoke-tubes and water-tubes passing through the plate above the fire-box, the water-tubes being connected with the ann ular space around the tire-box and provided each with an interior obstruction, constructed substantially as shown,- and for the purposes set forth.

3. The continuous spiral wire obstruction located within the water-circulating tube of a steam -boiler and combined therewith, substantially as and for the purposes set forth.

In testimony that I claim the foregoing I have hereunto set my hand in the presence of two witnesses.

M [RTILLOW It. CLAPP.

Vitnesses:

J. T. B. BOGARDUS, F. L. Irrorrna. 

